I'm not going to get into an argumentative comparison of boats. I used to tell customers that there really were NO bad sailboats. In truth, I suppose, there are a very few that make me raise my eyebrows, but all seem to have a place in someone's heart. If, in leaving your boat, you are compelled to look back over your shoulder just one more time to see her sitting there in all her glory - that boat is surely for you.
Steps was asking for specific data I had accumulated and my interpretation, which was, of course, subjective and mostly in reference to aesthetics.
I always grin a little when someone on this site has asked for an opinion on a particular boat or two, and someone else immediately jumps in and says "Oh forget that, you should get a *** 47!" And then I look over at the new poster's info, and of course he has a ***47. It just proves we all love our boats, and would probably love another one just as much if it were ours.
When I bought my O'day 31, the previous owner said,"she's pretty tender." I mostly kept quiet, but thought "Hmmm - that's contrary to almost every review I have read." Just check out the reviews on this site alone. People seem to be pretty comfortable with "30 kt winds and 5' seas."
Interestingly the Pearson 323 is VERY MUCH like the O'day 31. I will attach spreadsheet here if I can figure out that process. Where they differ slightly, I think Steps would give the edge to the O'day - greater beam for form stability, greater draft for stability and righting moment, 38% ballast ratio vs. 35, diesel fuel on board rather than gasoline. Obviously there are many other factors which could substantiate this "edge" OR negate it completely. Particularly WL beam which we don't know.
Both are "headsail oriented" boats with smallish high aspect ratio mainsails. The J and E measurements are almost identical. In fact, the asymmetrical Spinnaker on my O'day 31 was actually made for a Pearson 323. THe SA/DSPL ratio for the 2 boats is nearly identical.
For what it's worth, the mean national PHRF ratings for the two boats show the O'day faster by 9 seconds per mile.
All of this means NOTHING, really. See paragraph 1. Digest the numbers, if you're a "numbers guy" then again, read paragraph 1.